fix: version info

Signed-off-by: Dennis Zhuang <killme2008@gmail.com>

Author: killme2008

README.md

@@ -21,6 +21,12 @@ In vibe coding workflows, you run an AI coding tool in one terminal and build co
 go install github.com/killme2008/devtap/cmd/devtap@latest
 ```
 
+Or install via Homebrew:
+
+```bash
+brew install killme2008/tap/devtap
+```
+
 Or download from [GitHub Releases](https://github.com/killme2008/devtap/releases).
 
 ### Setup

cmd/devtap/main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"os"
+	"runtime/debug"
 
 	"github.com/killme2008/devtap/internal/mcp"
 )
@@ -11,9 +12,24 @@ import (
 var version = "dev"
 
 func main() {
+	setVersionFromBuildInfo()
 	mcp.ServerVersion = version
 	if err := rootCmd().Execute(); err != nil {
 		fmt.Fprintln(os.Stderr, err)
 		os.Exit(1)
 	}
 }
+
+func setVersionFromBuildInfo() {
+	if version != "dev" {
+		return
+	}
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return
+	}
+	if info.Main.Version == "" || info.Main.Version == "(devel)" {
+		return
+	}
+	version = info.Main.Version
+}